Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa07de0c6110c95…

MALICIOUS

PDF

74.5 KB Created: 2021-03-23 04:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 26ad3405258169ed1405977735045ca5 SHA-1: b6a04d58f597a9a18cd080a7480dda9c2372738e SHA-256: 4fa07de0c6110c957cc0685432925ed51f48ffca238df6ff36e3845486ac1ac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=stay+with+me+piano+score+pdf PDF link annotation
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/wakumowov.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/50033033232.pdfIn PDF document text
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/b3a72f8ea09ae62.pdfIn PDF document text
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/letiva_sisaviga.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/jhiTigk/delivery_from_the_pain_survival_guide.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/vapetexowoxenup_rizek.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/farawemadezi.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/LgefibQ/98373869753.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/ibjaeOM/lagegogomedujuwevovetu.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/l0HHijd/wavelet_headphone_specific_equalization_pro_apk.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/afcb27a67cc.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/6R5tib3/wabamikedunuwaluzomibipe.pdfIn PDF document text
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/5580991.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/cYMLifP/poluroxitawetamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/tijezokobu.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/commandos_2_game_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_find_the_area_and_perimeter_of_composite_shapes.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/55639354004.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/68447386943.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/cuisine_royale_android.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 5660 bytes
SHA-256: 35d52c336e2c94074db57a56967a089f7057ff2ebc98e31a851c688984ba48fb
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 11656 bytes
SHA-256: 9616cba0eea7c6f29a7e12977a597e9ed2d3a0002fcc439406fad4ab82187610

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